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Please use this identifier to cite or link to this item: http://repositorio.ufba.br/ri/handle/ri/8323

Title: The determination of molybdenum in water and biological samples by graphite furnace atomic spectrometry after polyurethane foam column separation and preconcentration
Other Titles: Talanta
Authors: Ferreira, Sergio Luis Costa
Santos, Hilda Costa dos
Campos, Reinaldo C.
Keywords: Molybdenum;Graphite furnace;Polyurethane foam
Issue Date: 2003
Publisher: Elservier
Abstract: A system for molybdenum separation and enrichment aiming its determination in water and biological samples by graphite furnace atomic absorption spectrometry (GFAAS) is proposed. The procedure is based on the sorption of the molybdenum (VI) thiocyanate complex onto a mini-column packed with polyurethane foam (PUF). The elution is accomplished by a 3.0 mol l 1 nitric acid solution. Flow variables were optimized and an enrichment factor of 10 as well as a limit of detection (LOD) (3 s) of 0.08 mg l 1 in the sample solution were achieved. The coefficient of variation showed values of 3 and 2% for molybdenum solutions of 2.0 and 10.0 mg l 1, respectively. The accuracy of the method was confirmed by the good concordance between found and certified values in the analysis of certified reference materials (CRMs) (CASS-3 Nearshore Seawater, NIST 1547 Peach Leaves, NIST 1515 Apple Leaves and NIST 1572 Citrus Leaves). The procedure was also applied for the molybdenum determination in mineral waters as well as in produced water samples. The results obtained for the mineral water samples compared well with those obtained by ICPMS. Concerning the produced water samples, in spite of their large salinity, recoveries of 90 to 120% at the 1 mg l 1 were observed
Description: Texto completo: acesso restrito. p. 789-795
URI: http://www.repositorio.ufba.br/ri/handle/ri/8323
ISSN: 0039-9140
Appears in Collections:Artigos Publicados em Periódicos (Quimica)

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